Glucagon causesGroup of answer choicesan increase in fatty acid synthesis and lipid storageAn increase in blood glucose concentrationAn increase in glycogen synthesisAn increase in glucose utilisation and storage

The correct answer is: An increase in blood glucose concentration.

Here's a step-by-step explanation:

1. Glucagon is a hormone produced by the pancreas.

2. Its primary role is to prevent blood glucose levels from dropping too low. To do this, it acts on the liver in several ways:

3. First, it stimulates the conversion of stored glycogen (the stored form of glucose) into glucose, which is then released into the bloodstream.

4. Second, it promotes the production of new glucose (a process called gluconeogenesis) from amino acids and other substrates.

5. Finally, it reduces the liver's consumption of glucose.

6. All of these actions result in an increase in the concentration of glucose in the blood.

The other options - an increase in fatty acid synthesis and lipid storage, an increase in glycogen synthesis, and an increase in glucose utilisation and storage - are not effects of glucagon. In fact, they are more likely to be effects of insulin, which is another hormone produced by the pancreas that has the opposite effects of glucagon.